| Acronym | Definition |
|---|
| ICSG | International Copper Study Group (intergovernmental organization; Lisbon, Portugal) |
| ICSG | International Conference on Structural Genomics |
| ICSG | Irish Centre for Social Gerontology (National University of Ireland) |
| ICSG | Internet Communications Software Group (Cisco Systems, Inc.) |
| ICSG | Italian Cooperative Study Group (chronic myeloid leukemia) |
| ICSG | Interstitial Cystitis Support Group (England, UK) |
| ICSG | International Centre of Social Gerontology |
| ICSG | International Council of Surgical Gastroenterology |
| ICSG | Internet Cancer Support Group |
| ICSG | International Convention on the Sale of Goods (treaty) |